PHP 7 adds many features, the most important of which are described below:
• Performance Improvements – PHPNG code is merged in PHP7 and is as fast as PHP twice as much as 5.
• Lower memory consumption – Optimized PHP 7 uses fewer resources.
• Scalar type declarations - parameter and return types can now be enforced.
• 64-bit support – Consistent support for computers with 64-bit architecture.
• Exception Hierarchy – The exception hierarchy has been improved.
• Many fatal errors converted to exceptions - The exception range has been increased to include many fatal errors converted as exceptions.
• Secure Random Number Generator - Added new secure random number generator API.
• Deprecated SAPIs and extensions removed - Various old and unsupported SAPIs and extensions have been removed from the latest version.
• Null coalescing operator (??) - New null coalescing operator added.
• Return type and scalar type declaration – Support for adding return types and parameter types.
• Anonymous class - supports adding anonymity.
• Zero cost asserts - Supports adding Zero cost asserts.
PHP 7 uses the new Zend Engine 3.0 to improve application performance, with performance nearly twice that of PHP 5.6 and memory consumption improved by 50%. It allows serving more concurrent users without requiring any additional hardware. PHP 7 is designed and refactored with current workloads in mind.
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